It will remove all the data ,contacts and apps that you installed
Start by switching off your tablet by holding the Power key for a short while.
Now press and hold together: Volume Up + Home + Power button.
Release held keys as soon as the Samsung Logo shows up on the screen.
Then select "wipe data / factory reset" using Volume buttons to navigate and Power button to confirm.
Afterwards choose "Yes -- delete all user data" to confirm whole operation.
In order to restart the device select "reboot system now".
Congratulations! The hard reset has just been performed.
If the display is off, press the Power key to turn it back on.
Afterwards go to Settings and then to Backup & reset.
In the next step tap Factory Dara Reset and then Reset Devive.
Choose Erase Everything if you are sure you want to clear all your data.
Select OK to confirm the whole operation.
Well done! Your device is ready to use.
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Restore Hard reset will set your phone in origional factorry settings. It will remove all the data and apps that you installed. Your contacts will be removed and you have to add them again.